crop factor on older lenses

Started Jun 6, 2014 | Questions thread
yonsito Regular Member • Posts: 128
Re: crop factor on older lenses

mbower wrote:

Ok, my next question -

I understand crop factor and that my 45mm lens is equivalent to a 90mm lens in the 35mm world.

But how do I calculate the crop factor for an older lens? I have the adaptor that lets me attach my Nikon 35mm prime to my M43s body.

What is the general crop factor that should be applied when one uses older lenses?


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Michael Bower
Ashburn, VA

The crop factor depends on the size of the camera sensor, compared to a 35mm film. The lenses have nothing to do with it.

The focal length is an optical characteristic of the lens. The Olympus 45mm should always be a 45mm lens. Your Nikon 35mm is also always a 35mm lens.

The crop factor tells you what the field of view of a lens on your camera will be. The lens perspective, however, remains the same. This is important and it's why I don't think you should consider your 45mm lens a 90mm lens.

Good explanation of the crop factor:

Good explanation of lens perspective:

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